Add Process Dependency Classifier

[OpenDataAlex]

Need to add process dependency type classifier to define how dependencies are handled. Hard dependencies mean the process should wait for it's parent(s) to finish, soft dependencies mean the process should wait for a specific time and even if the parent(s) haven't finished, kick off.

[OpenDataAlex]

Have added the dependency_type table and relationships to extract_dependency and process_dependency. Need to incorporate the type into an overhaul of how dependencies are handled. Will leave this story in backlog until the overhaul is done.